text: Uranium tetrafluoride reacts with fluorine, first to give uranium pentafluoride and then volatile UF:
  :2UF  +  F  →  2UF
  :2UF  +  F  →  2UF
  UF is reduced by magnesium to give the metal:
  :UF  +  2Mg  →  U  + 2MgF
  It is oxidized to UF at room temperature and then, at 100°C, to the hexafluoride.